I sent a ticket and got the following responce:
(for the record, I found the launcher and initially didn't run it as admin and it started to download and install fine.
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You may need to run the launcher as an administrator. There are instructions below on how to do so:

1. To find the Launcher, you may need to activate 'View Hidden Files and Folders'

For Windows XP: - Open Start Menu and click on Control Panel. - Click Appearance and Themes, then Folder Options

For Windows 7 and Vista:

- Open Start Menu and click on Control Panel - Click on Appearance and Personalization Link - Click on the Show hidden files and folders ****on under Folder Options - Under the Hidden files and folders section, select the radio ****on labeled Show Hidden files, folders and drives

Now navigate to the folder C:\Users\Your User Name\AppData\Local\Apps\2.0\70GDA0RP.Y27\GZ5Y9HLY. C3C\laun...app_0000000000000000_0001.0000_14775cfa 4c94dd3f. It may be easier to search for Launcher.exe in the Start menu. Right click on the Launcher.exe and select "Run as Administrator."
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I copied the launcher.exe and then pasting a shortcut to your desktop. Now on the shortcut, I did.. properties, compatibility. Set compatibility to Vista SP2 and check Run as admin. For the sake of thoroughness, I also went to the settings for all users and do the same. After applying and oking both it worked like a charm for me.